First Hints of Pressure Waves in a Helical Extragalactic Jet: S5 0836+710
One of the open questions in extragalactic jet Astrophysics is related to the nature of the observed radio jet, namely whether it traces a pattern or the flow structure itself. In this paper I summarize the evidence collected for the presence of waves in extragalactic jets. The evidence points towar...
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Czech Technical University in Prague
2014-12-01
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| Series: | Acta Polytechnica CTU Proceedings |
| Online Access: | https://ojs.cvut.cz/ojs/index.php/APP/article/view/2411 |
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| author | Manel Perucho |
| author_facet | Manel Perucho |
| author_sort | Manel Perucho |
| collection | DOAJ |
| description | One of the open questions in extragalactic jet Astrophysics is related to the nature of the observed radio jet, namely whether it traces a pattern or the flow structure itself. In this paper I summarize the evidence collected for the presence of waves in extragalactic jets. The evidence points towards the peak of emission in helical jets corresponding to pressure-maxima of a wave that is generated within the core region and propagates downstream. Making use of a number of very long baseline interferometry (VLBI) observations of the radio jet in the quasar S5 0836+710 at dierent frequencies and epochs, Perucho et al. (2012a) were able to observe wave-like behavior within the observed radio-jet. The ridge-line of the emission in the jet coincides within the errors at all frequencies. Moreover, small differences between epochs at 15 GHz reveal wave-like motion of the ridge-line transversal to the jet propagation axis. The authors conclude that the helicity is a real, physical structure. I report here on those results and discuss them in the light of new results recently announced by other authors that confirm the presence of waves in the close-by object BL Lac (Cohen et al., in preparation). |
| format | Article |
| id | doaj-art-d9cd577087554dd3b7c2e332b600ac3e |
| institution | DOAJ |
| issn | 2336-5382 |
| language | English |
| publishDate | 2014-12-01 |
| publisher | Czech Technical University in Prague |
| record_format | Article |
| series | Acta Polytechnica CTU Proceedings |
| spelling | doaj-art-d9cd577087554dd3b7c2e332b600ac3e2025-08-20T02:51:19ZengCzech Technical University in PragueActa Polytechnica CTU Proceedings2336-53822014-12-011126526810.14311/APP.2014.01.02652223First Hints of Pressure Waves in a Helical Extragalactic Jet: S5 0836+710Manel Perucho0Departament d'Astronomia i Astrofsica. Universitat de Valencia. C/Dr. Moliner 50, 46100, Burjassot, Valencian Country, SpainOne of the open questions in extragalactic jet Astrophysics is related to the nature of the observed radio jet, namely whether it traces a pattern or the flow structure itself. In this paper I summarize the evidence collected for the presence of waves in extragalactic jets. The evidence points towards the peak of emission in helical jets corresponding to pressure-maxima of a wave that is generated within the core region and propagates downstream. Making use of a number of very long baseline interferometry (VLBI) observations of the radio jet in the quasar S5 0836+710 at dierent frequencies and epochs, Perucho et al. (2012a) were able to observe wave-like behavior within the observed radio-jet. The ridge-line of the emission in the jet coincides within the errors at all frequencies. Moreover, small differences between epochs at 15 GHz reveal wave-like motion of the ridge-line transversal to the jet propagation axis. The authors conclude that the helicity is a real, physical structure. I report here on those results and discuss them in the light of new results recently announced by other authors that confirm the presence of waves in the close-by object BL Lac (Cohen et al., in preparation).https://ojs.cvut.cz/ojs/index.php/APP/article/view/2411 |
| spellingShingle | Manel Perucho First Hints of Pressure Waves in a Helical Extragalactic Jet: S5 0836+710 Acta Polytechnica CTU Proceedings |
| title | First Hints of Pressure Waves in a Helical Extragalactic Jet: S5 0836+710 |
| title_full | First Hints of Pressure Waves in a Helical Extragalactic Jet: S5 0836+710 |
| title_fullStr | First Hints of Pressure Waves in a Helical Extragalactic Jet: S5 0836+710 |
| title_full_unstemmed | First Hints of Pressure Waves in a Helical Extragalactic Jet: S5 0836+710 |
| title_short | First Hints of Pressure Waves in a Helical Extragalactic Jet: S5 0836+710 |
| title_sort | first hints of pressure waves in a helical extragalactic jet s5 0836 710 |
| url | https://ojs.cvut.cz/ojs/index.php/APP/article/view/2411 |
| work_keys_str_mv | AT manelperucho firsthintsofpressurewavesinahelicalextragalacticjets50836710 |